High temperature transfer material



iatented Aug. 23, 1932 NEW JERSEY, ASSIGNOB TO DOHERTY RESEARCH N. Y., A CORPORATION OF DELAWARE {form 1). human, or son'r'rr ORANGE, eomi'en ux'or NEW YORK,

HIGH TEMPERATURE TRANSFER MATERIAL No Drawing. Application filed April 8, 1930. Serial N'o. 442,715.

This invention relates to a refractory mafused chromic oxide and i to 6 parts chromic terial for high temperature apparatus, and oxide powder. has for its object the production of a material capable of continued use at high temparts silicon carbide, 43 parts fused chromic peratures and which shall have high heat oxide, and 5 parts chromicoxide powder.

difiusivity and a high co-efiicient of heat con- In testimony whereof I affix my signature. ductivity. JOHN D. MORGAN.

According to the preferred form of the in- V i I vention a mixture 0 approximately parts of graded silicon carbide aggregate, 43 parts of fused chromic oxide, 5 parts of chromic oxide powder, and the equivalent of about I 2% of Cr O in the form of chromium sulphate or potassium bi-chromate is molded to the desired form and needs but to be fired to a temperature of approximately 1800 F., at which temperature it acquires sufficient hardness and durability to withstand temperatures of the order of 2800 F.

The refractory material so formed has, compared with other non-metallic refractory materials, a high co-efiicient of heat conductivity, it being more than one-half that of cast iron at temperatures of 2000". and over.

The composition is therefore useful in connection with high temperature furnaces and in other places where a highly refractory material must be used under conditions where high heat conductivity is desired.

The material may be formed into bricks or molded into the shape of a desired article.

While the proportions stated above for the various materials are the most desirable, it is found that these proportions may be varied over wide limits. Good results are obtained if 20-80 parts of silicon carbide are used toether with 13-73 parts fused chromic oxide and i-6 parts of chromic oxide powder.

Having thus described the invention what is claimed as new is:

1. An article of manufacture containing 7 silicon carbide and-fused chromic oxide.

2. An article of manufacture containing 20 to 80 parts silicon carbide, 13 to 7 3. parts 3. An article of manufacture containing 50 

